Table 3.

Crude incidence rates (per 100,000 person-years), direct standardized incidence rates (per 100,000 person-years), and standardized rate ratios for each glomerular disease as a function of socioeconomic position

Income Quintile	N (%)	Crude Rate (95% CI)	Standardized Rate (95% CI)	Standardized Rate Ratio (95% CI)
Membranous nephropathy
1 (lowest)	86 (22)	0.97 (0.76 to 1.17)	0.98 (0.77 to 1.19)	1.11 (0.81 to 1.52)
2	89 (23)	1.02 (0.81 to 1.23)	1.03 (0.82 to 1.24)	1.17 (0.86 to 1.59)
3	70 (18)	0.80 (0.61 to 0.98)	0.81 (0.62 to 1.00)	0.92 (0.67 to 1.28)
4	72 (18)	0.83 (0.64 to 1.03)	0.85 (0.65 to 1.04)	0.96 (0.69 to 1.33)
5 (highest)	75 (19)	0.89 (0.69 to 1.10)	0.88 (0.68 to 1.08)	1.0 (Reference)
ANCA-related GN
1 (lowest)	96 (25)	1.08 (0.86 to 1.30)	1.06 (0.85 to 1.27)	1.50 (1.09 to 2.06)a
2	80 (21)	0.91 (0.71 to 1.11)	0.91 (0.71 to 1.10)	1.28 (0.92 to 1.79)
3	84 (22)	0.95 (0.75 to 1.16)	0.98 (0.77 to 1.19)	1.39 (1.0 to 1.94)b
4	68 (18)	0.79 (0.60 to 0.98)	0.83 (0.64 to 1.03)	1.18 (0.83 to 1.67)
5 (highest)	59 (15)	0.70 (0.52 to 0.88)	0.71 (0.53 to 0.89)	1.0 (Reference)
IgA nephropathy
1 (lowest)	190 (23)	2.14 (1.83 to 2.44)	2.12 (1.82 to 2.43)	1.22 (0.98 to 1.51)
2	187 (23)	2.14 (1.83 to 2.44)	2.12 (1.82 to 2.42)	1.22 (0.98 to 1.51)
3	166 (20)	1.89 (1.60 to 2.17)	1.87 (1.59 to 2.16)	1.08 (0.86 to 1.34)
4	130 (16)	1.51 (1.25 to 1.76)	1.50 (1.24 to 1.76)	0.86 (0.68 to 1.09)
5 (highest)	145 (18)	1.73 (1.45 to 2.01)	1.74 (1.46 to 2.03)	1.0 (Reference)
FSGS
1 (lowest)	100 (27)	1.13 (0.91 to 1.35)	1.12 (0.90 to 1.33)	1.55 (1.13 to 2.13)b
2	78 (21)	0.89 (0.69 to 1.09)	0.89 (0.70 to 1.09)	1.24 (0.89 to 1.74)
3	64 (17)	0.73 (0.55 to 0.91)	0.74 (0.56 to 0.91)	1.02 (0.72 to 1.46)
4	73 (19)	0.85 (0.65 to 1.04)	0.87 (0.67 to 1.06)	1.20 (0.86 to 1.70)
5 (highest)	60 (16)	0.71 (0.53 to 0.90)	0.72 (0.54 to 0.90)	1.0 (Reference)
Lupus nephritis in women
1 (lowest)	83 (26)	1.82 (1.43 to 2.22)	1.81 (1.42 to 2.19)	1.70 (1.19 to 2.42)c
2	75 (23)	1.68 (1.30 to 2.06)	1.66 (1.29 to 2.04)	1.56 (1.08 to 2.26)a
3	66 (20)	1.47 (1.12 to 1.83)	1.44 (1.10 to 1.79)	1.36 (0.93 to 1.98)
4	54 (17)	1.24 (0.91 to 1.57)	1.23 (0.90 to 1.56)	1.15 (0.78 to 1.72)
5 (highest)	44 (14)	1.04 (0.73 to 1.34)	1.06 (0.75 to 1.38)	1.0 (Reference)
Lupus nephritis in men
1 (lowest)	17 (25)	0.39 (0.21 to 0.58)	0.40 (0.21 to 0.58)	1.64 (0.76 to 3.55)
2	15 (22)	0.35 (0.17 to 0.53)	0.35 (0.17 to 0.53)	1.45 (0.66 to 3.21)
3	13 (19)	0.30 (0.14 to 0.46)	0.30 (0.14 to 0.46)	1.24 (0.55 to 2.83)
4	12 (18)	0.28 (0.12 to 0.44)	0.28 (0.12 to 0.44)	1.16 (0.50 to 2.69)
5 (highest)	10 (15)	0.24 (0.09 to 0.39)	0.24 (0.09 to 0.39)	1.0 (Reference)

^aP<0.01.

^bP<0.05.

^cP<0.001.